Where to report and discuss UI "bugs" and inconstancies?
If you have a full proposal (detailed design docs), it should be ok to open a task on http://developer.blender.org/ and discuss there (staff only!)

You can discuss with the community at http://blenderartists.org/ to generate ideas, exchange mockups and find to a practical proposal. Then it's time to write it down on a wiki page for example.

Implement the ideas or find someone who does, then submit something working (a patch/diff) to the tracker. If there's no one to actually code it, it will likely be considered a feature request and not gain much attention there are just too many and not everyone will agree on a certain solution...